Control valve for welding torch and the like
AssigneePatbern, Inc.
InventorsPasqualino P. Iovino, Bernard R. Danti
Life of this patent
Estimating the term…
Abstract
An improved valve, and assembly incorporating the valve, which finds particular use in welding and cutting torch control applications. The valve comprises a quick, slide-actuated, on-off control which dispenses with the need to adjust the flow of gases to the torch each time flame start-up is required. The valve also incorporates a variable pilot setting which includes an easily-manipulated cam-adjustment.
Claims9
In a valve of the type comprising central axial conduits within a cylinder which conduit form, respectively, inlet and outlet flowpaths within said valve but which flowpaths do not directly communicate with each other,
- a first aperture through said cylinder forming means to permit fluid egress from said inlet flowpath,
- an adjustable slidable sleeve member mounted around said cylinder,
- at least three seal members mounted within said sleeve for sliding movement with said sleeve along said cylinder, and
- a central member of said seal members forming means to seal said sleeve member against said cylinder when said central seal is in one position between said first and second apertures forming means to prevent flow of gas through said valve, said central seal member being slidably removable from such first position to permit the flow of gas through said valve, and said two other said seals forming means to seal flow of gas to atmosphere between said cylinder member and said slidable sleeve member;
- the improvement wherein said central seal member and a groove of varying cross section cut along the axial direction of said cylinder member form an adjustable pilot flowpath between said first and second apertures and means to adjust the stop position of said central seal member with respect to said groove of varying cross section.
A three position, manually-operable valve comprising an on-position, off-position, and an intermediate pilot-flow position wherein each position is achieved by movement of an exterior sleeve member along the outer periphery of an apertured internal conduit member extending axially beyond said valve member;
- said sleeve member and apertured conduit member forming, together with seals mounted between them, the flow paths through said valve;
- and wherein said valve comprises a cam follower and a cam, at least one of which is mounted on said sleeve member and the other of which is mounted around the circumference of said conduit member, said cam follower and cam means forming manual means to provide careful adjustment of the position of said sleeve with respect to a pilot flow path between seals mounted between said conduit member and said seal member.
Dependencies are inferred from the claim text.